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an online publication on recent pollen

Rhododendron luteum

Taxonomy: Angiospermae, Ericales, Ericaceae, Rhododendron

Published: 2016-12-04

Pollen Description

Shape, Size and Aperture

pollen unit: tetrad,  dispersal unit and peculiarities: tetrad tetrahedral,  size (pollen unit): large (51-100 µm),  size of hydrated pollen (LM): -,  shortest polar axis in equatorial view (LM): -,  longest polar axis in equatorial view (LM): -,  shortest diameter in equatorial or polar view (LM): -,  longest diameter in equatorial or polar view (LM): -,  pollen class: colporate,  polarity: heteropolar,  P/E-ratio: -,  shape: -,  outline in polar view: circular,  dominant orientation (LM): -,  P/E-ratio (dry pollen): -,  shape (dry pollen): -,  outline in polar view (dry pollen): -,  infoldings (dry pollen): interapertural area sunken,  aperture number: 3,  aperture type: colporus,  aperture condition: colporate, tricolporate,  aperture peculiarities: -

Ornamentation and Structure

LMornamentation LM: -,  nexine: -,  sexine: -,  SEMornamentation SEM: fossulate,  suprasculpture SEM: -,  TEMtectum: -,  infratectum: -,  foot layer: -,  endexine: -,  intine: -,  wall peculiarities: viscin threads,  supratectal element: -

Miscellaneous

pollen coatings: -,  reserves in cytoplasm: -,  cell number: -,  Ubisch bodies: -

Author(s) of diagnosis: Halbritter, Heidemarie

Pictures

tetrads connected by viscin threads

1. tetrads connected by viscin threads

polar view of tetrad

2. polar view of tetrad

detail of aperture with viscin threads

3. detail of aperture with viscin threads

detail of viscin thread

4. detail of viscin thread

dry tetrads

5. dry tetrads

Picture legend

  1. tetrads connected by viscin threads - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  2. polar view of tetrad - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  3. detail of aperture with viscin threads - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  4. detail of viscin thread - fresh, rehydrated (water) & critical point dried & sputter coated with gold, photographer: Halbritter, H.
  5. dry tetrads - dry, sputter coated with gold, photographer: Halbritter, H.

Literature

  • Bowers CG () The development of pollen and viscin strands in Rhododendron catawbiense. Bull Torrey Bot Club 57: 285-313
  • Cullen J, Chamberlain DF (1978) A preliminary synopsis of the genus Rhododendron: II. Notes Roy Bot Gard Edinburgh 36: 105-126
  • Kaul V, Theunis CH, Palser BF, Knox RB, Williams EG (1987) Association of the generative cell and vegetative nucleus in pollen tubes of Rhododendron. Ann Bot 59: 227-235
  • King MJ, Buchmann SL (1995) Bumble bee-initiated vibration release mechanism of Rhododendron pollen. Amer J Bot 82: 1407-1411
  • Krutzsch W (1991) Gliederung, Verbreitung und Entstehung der Gattung Rhododendron - Eine Synthese aus botanischer, paläobotanischer und geologischer Sicht. Feddes Rep 102: 1-2, 11-28
  • Palser BF, Rouse JL, Williams EG (1992) A scanning electron microscope study of the pollen tube pathway in pistils of Rhododendron. Can J Bot 70: 1039-1060
  • Taylor P, Kenrick J, Li Y, Kaul V, Gunning BES, Knox RB (1989) The male germ unit of Rhododendron: quantitative cytology, three-dimensional reconstruction, isolation and dedection using fluorescent probes. Sex Pl Reprod 2: 254-264
  • Zetter R, Hesse M (1996) The morphology of pollen tetrads and viscin threads in some Tertiary, Rhododendron-like Ericaceae. Grana 35: 285-294
  • Halbritter, H (1998) Preparing living pollen material for scanning electron microscopy using 2,2-dimethoxypropane (DMP) and criticalpoint drying. Biotechnic Histochem 73: 137–143

Copyright and Citation

Cite this publication as:

Halbritter H. 2016. Rhododendron luteum. In: PalDat - A palynological database. https://www.paldat.org/pub/Rhododendron_luteum/302696;jsessionid=88CD3C4BA2A3DAECCED63AE2CA100D90; accessed 2024-03-28

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